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Model‐free data screening and cleaning

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Abstract Categories of data screening and cleaning issues are reviewed and discussed. Bivariate model‐free approaches, specialized model‐free regression techniques, together with order statistic‐based (OSB) approaches are illustrated and shown to be of particular value for a variety of data screening and cleaning applications. It is shown how a combination of curve estimation with OSB approaches can help screen a progression to AIDS data set. WIREs Comp Stat 2011 3 168–176 DOI: 10.1002/wics.140 This article is categorized under: Statistical and Graphical Methods of Data Analysis > Density Estimation Statistical and Graphical Methods of Data Analysis > Data Reduction, Smoothing, and Filtering Statistical and Graphical Methods of Data Analysis > Nonparametric Methods

Scatter diagram (point cloud), mixture data.

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Sharp edge disclosed by mean‐based model‐free regression curve.

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Least squares fitted line with mean, median and mode‐based, model‐free regression curve.

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Scatter diagram, model‐free density estimator used to select plotting character.

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Statistical and Graphical Methods of Data Analysis > Nonparametric Methods
Statistical and Graphical Methods of Data Analysis > Density Estimation
Statistical and Graphical Methods of Data Analysis > Data Reduction, Smoothing, and Filtering

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